Journal
CHEMOSPHERE
Volume 228, Issue -, Pages 412-417Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2019.04.164
Keywords
Ultrasound; Zero valent iron; Peroxymonosulfate; Rhodamine B; Sulfate radical
Categories
Funding
- National Natural Science Foundation of China [51508116, U1501231]
- Project of Guangdong Provincial Key Laboratory of radioactive contamination control and resources [2017B030314182]
- Guangdong Provincial Natural Science Foundation [2016A030310265]
- Science and Technology Research Programs of Guangzhou City [201804020072, 201607010311]
- University's 2017 training program for young topnotch personnels [BJ201706]
- [XJ2016037]
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In this work, ultrasound (US) irradiation assisted powder zero valent iron (ZVI) corrosion was conducted for peroxymonosulfate (PMS) activation. PMS activation activity was evaluated by Rhodamine-B (Rh B) degradation efficiency. The other US/PMS, ZVI/PMS, Fe2+/PMS and US/PMS/Fe2+ systems were performed to investigate the synergistic effects of US and ZVI on PMS activation activity. US/PMS/ZVI system performed the highest activity of Rh B degradation. 99.76% of Rh B was removed within 12 min under the optimum condition (pH = 4.5, ZVI dosage = 1 PMS = 1 mM, US power = 50W). A comparison of US/PMS/ZVI system with PMS/ZVI and homogeneous US/PMS/Fe2+ systems for Rh B degradation was conducted, indicating that ultrasound irradiation contributed to acceleration of ZVI corrosion and removal of passive films. Besides, the electrons transformation from Fe to PMS made main contribution to the generation of sulfate radical, which resulted in the ability of degradation of Rh B. ZVI could be reused for five cycles with efficient activity of PMS activation. Exhaustion of ZVI led to the decrease in PMS activation at the sixth recycle. Thus, this work presents important information on understanding reuse of iron fillings for PMS/PS activation in practical application of pollution remediation. (C) 2019 Elsevier Ltd. All rights reserved.
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